凶器的英文：
cold iron

参考例句：

A deadly weapon,such as a firearm or switchblade.
凶器致命的武器，如火器、弹簧刀等

So a vehicle in irresponsible hands can be a most lethal weapon
在一个不负责任的人手中，一辆车可以变成一件杀人凶器。

Police arrested the man for illegal possession of a weapon.
随后，警方以非法私藏凶器为由逮捕了该男子。

The thieves are often armed and in some cases have killed for their plunder.
这些小偷常携带凶器，有时会为赃物杀人。

The first exhibit is a knife which the prosecution claimed is the murder weapon.
当庭出示的第一件物证是一把刀，据原告称是为谋杀凶器。

The first exhibit is a knife which the prosecution claimed being the murder weapon
当庭出示的第一件物证是一把刀,据原告称是为谋杀凶器

cold是什么意思：
adj. 寒冷的；冷淡的；失去知觉的
n. 寒冷；感冒
adv. 完全地

Colds are catching.
感冒是有传染性的。

a cold unfriendly nod; a cold and unaffectionate person; a cold impersonal manner; cold logic; the concert left me cold.
冷淡、不友好的打瞌睡；冷漠、没有感情的人；冷漠的客观态度；冷静的逻辑推理；音乐会让我扫兴。

You catch a cold in summer when the air is not cold.
在夏天，天气不冷时，你也会感冒。

The cold weather froze the lake.
寒冷的天气把湖冻住了。

Winter is a time of cough and cold.
冬季是易患咳嗽和感冒的季节。

iron是什么意思：
n. 铁；铁质；熨斗；刚强；毅力；铁头球杆
v. 烫平，熨
adj. 铁的，刚强的

The hot iron seared the trousers.
热熨斗烫焦了长裤。

Iron oxide red pigments
GB/T1863-1989氧化铁红颜料

Strike while the iron is hot.
打铁趁热。

Iron corrode easily.
铁易受腐蚀。

The party has iron discipline!
党有铁的纪律！